Re:Leaping Brain's "Virtually Uncrackable" DRM is just an XO...
by tshtf on Monday November 26, 2012 @07:20PM
(#4834795)
He just performed a bitwise XOR of the plaintext and ciphertext stream to obtain the key.
From the post:
By comparing the binary files, I discovered the "proprietary video encryption" algorithm: for the first 15kB, each 1kB block has its initial bytes xor'd with the string "RANDOM_STRING".
From the post:
By comparing the binary files, I discovered the "proprietary video encryption" algorithm: for the first 15kB, each 1kB block has its initial bytes xor'd with the string "RANDOM_STRING".
See:
https://en.wikipedia.org/wiki/XOR_cipher